Method getOptimizedCornerPoints

qcustomplot/qcustomplot.cpp:22637–22787

! \internal This function is part of the curve optimization algorithm of \ref getCurveLines. In situations where a single segment skips over multiple regions it might become necessary to add extra points at the corners of region 5 (see \ref getRegion) such that the optimized segment doesn't unintentionally cut through the visible area of the axis rect and create plot artifacts. Thi

  traversing 5.
*/
QVector<QPointF> QCPCurve::getOptimizedCornerPoints(int prevRegion, int currentRegion, double prevKey, double prevValue, double key, double value, double keyMin, double valueMax, double keyMax, double valueMin) const
{
  QVector<QPointF> result;
  switch (prevRegion)
  {
    case 1:
    {
      switch (currentRegion)
      {
        case 2: { result << coordsToPixels(keyMin, valueMax); break; }
        case 4: { result << coordsToPixels(keyMin, valueMax); break; }
        case 3: { result << coordsToPixels(keyMin, valueMax) << coordsToPixels(keyMin, valueMin); break; }
        case 7: { result << coordsToPixels(keyMin, valueMax) << coordsToPixels(keyMax, valueMax); break; }
        case 6: { result << coordsToPixels(keyMin, valueMax) << coordsToPixels(keyMin, valueMin); result.append(result.last()); break; }
        case 8: { result << coordsToPixels(keyMin, valueMax) << coordsToPixels(keyMax, valueMax); result.append(result.last()); break; }
        case 9: { // in this case we need another distinction of cases: segment may pass below or above rect, requiring either bottom right or top left corner points
          if ((value-prevValue)/(key-prevKey)*(keyMin-key)+value < valueMin) // segment passes below R
          { result << coordsToPixels(keyMin, valueMax) << coordsToPixels(keyMin, valueMin); result.append(result.last()); result << coordsToPixels(keyMax, valueMin); }
          else
          { result << coordsToPixels(keyMin, valueMax) << coordsToPixels(keyMax, valueMax); result.append(result.last()); result << coordsToPixels(keyMax, valueMin); }
          break;
        }
      }
      break;
    }
    case 2:
    {
      switch (currentRegion)
      {
        case 1: { result << coordsToPixels(keyMin, valueMax); break; }
        case 3: { result << coordsToPixels(keyMin, valueMin); break; }
        case 4: { result << coordsToPixels(keyMin, valueMax); result.append(result.last()); break; }
        case 6: { result << coordsToPixels(keyMin, valueMin); result.append(result.last()); break; }
        case 7: { result << coordsToPixels(keyMin, valueMax); result.append(result.last()); result << coordsToPixels(keyMax, valueMax); break; }
        case 9: { result << coordsToPixels(keyMin, valueMin); result.append(result.last()); result << coordsToPixels(keyMax, valueMin); break; }
      }
      break;
    }
    case 3:
    {
      switch (currentRegion)
      {
        case 2: { result << coordsToPixels(keyMin, valueMin); break; }
        case 6: { result << coordsToPixels(keyMin, valueMin); break; }
        case 1: { result << coordsToPixels(keyMin, valueMin) << coordsToPixels(keyMin, valueMax); break; }
        case 9: { result << coordsToPixels(keyMin, valueMin) << coordsToPixels(keyMax, valueMin); break; }
        case 4: { result << coordsToPixels(keyMin, valueMin) << coordsToPixels(keyMin, valueMax); result.append(result.last()); break; }
        case 8: { result << coordsToPixels(keyMin, valueMin) << coordsToPixels(keyMax, valueMin); result.append(result.last()); break; }
        case 7: { // in this case we need another distinction of cases: segment may pass below or above rect, requiring either bottom right or top left corner points
          if ((value-prevValue)/(key-prevKey)*(keyMax-key)+value < valueMin) // segment passes below R
          { result << coordsToPixels(keyMin, valueMin) << coordsToPixels(keyMax, valueMin); result.append(result.last()); result << coordsToPixels(keyMax, valueMax); }
          else
          { result << coordsToPixels(keyMin, valueMin) << coordsToPixels(keyMin, valueMax); result.append(result.last()); result << coordsToPixels(keyMax, valueMax); }
          break;
        }
      }
      break;
    }